Q: I replace my ecm cranks once but won't start

asked by on

I replaced my ECM and now it cranks over once but won't start. Then if I was to try and start it for the 2nd time, it won't do anything. Not sure what it could be
My car has an automatic transmission.

Hi, thanks for writing in. There are a number of systems that your ECM controls. Be sure you are getting power to all of your critical components like fuel pump, injectors, coil packs, etc. Check to see if when cranking the car gets fuel. Do this by cranking it and then pulling a spark plug out to see if it is wet with fuel. Next check things like crank and cam sensors as these can cause the car to not produce a spark when not functioning properly as they contribute to proper timing.

If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to inspect and diagnose this issue for you, and make or suggest any repairs as needed.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. I replace my ecm cranks once but won't start

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Ran out gas and put gas back in but car still won't start

Hello. When the vehicle is completely drained of gas, the pump and related fuel system components can be stressed to the point of failure. This will cause the vehicle to not start Start by checking the easy components like the...

Q: Q: Brake lights staying on

The brake light switch has a small rubber bumper that pushes in on it to keep the light off. The rubber bumper falls apart with age and then the brake lights stay on. The bumper on the brake pedal linkage...

Q: Front low-beam headlight repair requires whole light assembly replacement

Hello. For your 2009 Saturn Outlook, there is an aftermarket part called a pigtail connector that can be spliced into the existing wiring fairly easily. You may be able to find instructions on the internet that would be able to...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.